This kind of face shape is suitable for hard to very hard and
abrasive rock formations in applications with high air pressures.
Good penetration rates an resistance to steel wash.

2. Convex Face

For high penetration rates in soft to medium-hard with low to
medium air pressures. It is the most resistance to steel wash, and
may reduce theload and wear on the gauge buttons, but poor hole
deviation control.

Changsha Tianhe Drilling Tools and Machinery Co., Ltd., is a
professional geotechnical drilling tools manufacturer since 2002.
We’re located in Jinzhou New District,Ningxiang County,
Changsha,Hunan province.Our main products include DTH
(down-the-hole) hammers and bits with capacity of drilling holes
from 64mm--1020mm in diameter, DTH drilling tools with large
diameter for deep hole drilling, eccentric casing system (ODEX) and
concentric casing system, reserve circulation hammers and bits,
drilling rig, rock drilling accessories and other relative
equipment. They are widely used in mining,water well and geothermal
drilling, anchoring, foundation and infrastructure,
piling,tunneling and other construction and geotechnical
engineering. They are exported to Sweden,Swiss,Finland,Italy,
France, Germany, Australia,South Korea,South Africa,Chile, Brazi
and other 30 countries.Teamwhole is proved to be the right choice
by more than 1000 customers all over the world.

Our registered capital is 6.5 million USD, and monthly capacity is
about 1000 sets of hammers. We have about 300 employees,among them
there are 80 specialized technicians,30 of them have over 20 years
working experiences in DTH drilling tools research and development.
We have the ISO9001:2008 certificate,over 30 technical patents, and
3 registered trademarks.We’re a council unit of China Drilling
Steel and Drilling Tools Association,the director unit of China
Heat Treatment Association, the well-known trademark enterprise of
Hunan Province, the high-tech enterprise of Hunan Province, the
geotechnical drilling equipment engineering of Changsha City
Technology research center and enterprise technology center.

The company always guide themselves with the service concept
"focus on users' requirements and meet to customers" needs " ,
flexibly apply the unique technology, strictly comply with the
standards of ISO9001 quality system, professionally commit to
research, development and application, and sincerely produce the
rock drilling tools with most specifications, easy operation,
reliable quality and good prices for all the global users. With
strong technical strength, we are making efforts to creat the best
brand of Chinese drilling tools, and to be the top manufacturer in
the world.